Plow blade



FIG. 1 is a front perspective view of a plow blade showing my new design;

FIG. 2 is a cross-sectional view thereof taken along line 2-2 in FIG.1;

FIG. 3 is a front elevation view thereof; and,

FIG. 4 is a rear elevation view thereof.

Portions of the plow blades in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a plow blade, as shown and described. 